update nginx config

backend/src/index.ts

@@ -77,7 +77,13 @@ const prisma = new PrismaClient();
 const PORT = process.env.PORT || 8000;
 
 // Multer setup for file uploads
-const upload = multer({ dest: uploadDir });
+const upload = multer({
+  dest: uploadDir,
+  limits: {
+    fileSize: 50 * 1024 * 1024, // 50MB in bytes
+    files: 1, // Only one file per upload
+  },
+});
 
 app.use(
   cors({
@@ -88,6 +94,22 @@ app.use(
 app.use(express.json({ limit: "50mb" }));
 app.use(express.urlencoded({ extended: true, limit: "50mb" }));
 
+// Log large requests for monitoring and debugging
+app.use((req, res, next) => {
+  const contentLength = req.headers["content-length"];
+  if (contentLength) {
+    const sizeInMB = parseInt(contentLength) / 1024 / 1024;
+    if (sizeInMB > 10) {
+      console.log(
+        `[LARGE REQUEST] ${req.method} ${req.path} - ${sizeInMB.toFixed(
+          2
+        )}MB - Content-Length: ${contentLength} bytes`
+      );
+    }
+  }
+  next();
+});
+
 const elementsSchema = z.array(z.object({}).passthrough());
 
 const appStateSchema = z.object({}).passthrough();